package com.github.link2fun.support.utils.http;

import cn.hutool.core.util.StrUtil;
import com.github.link2fun.support.constant.Constants;
import com.github.link2fun.support.utils.StringUtils;
import lombok.extern.slf4j.Slf4j;

import javax.net.ssl.*;
import java.io.*;
import java.net.ConnectException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;

/**
 * 通用http发送方法
 *
 * @author ruoyi
 */
@Slf4j
public class HttpUtils {

  /**
   * 向指定 URL 发送GET方法的请求
   *
   * @param url 发送请求的 URL
   * @return 所代表远程资源的响应结果
   */
  public static String sendGet(String url) {
    return sendGet(url, StrUtil.EMPTY);
  }

  /**
   * 向指定 URL 发送GET方法的请求
   *
   * @param url   发送请求的 URL
   * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
   * @return 所代表远程资源的响应结果
   */
  public static String sendGet(String url, String param) {
    return sendGet(url, param, Constants.UTF8);
  }

  /**
   * 向指定 URL 发送GET方法的请求
   *
   * @param url         发送请求的 URL
   * @param param       请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
   * @param contentType 编码类型
   * @return 所代表远程资源的响应结果
   */
  public static String sendGet(String url, String param, String contentType) {
    StringBuilder result = new StringBuilder();
    BufferedReader in = null;
    try {
      String urlNameString = StringUtils.isNotBlank(param) ? url + "?" + param : url;
      log.info("sendGet - {}", urlNameString);
      URL realUrl = new URL(urlNameString);
      URLConnection connection = realUrl.openConnection();
      connection.setRequestProperty("accept", "*/*");
      connection.setRequestProperty("connection", "Keep-Alive");
      connection.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
      connection.connect();
      in = new BufferedReader(new InputStreamReader(connection.getInputStream(), contentType));
      String line;
      while ((line = in.readLine()) != null) {
        result.append(line);
      }
      log.info("recv - {}", result);
    } catch (ConnectException e) {
      log.error("调用HttpUtils.sendGet ConnectException, url={},param={}", url, param, e);
    } catch (SocketTimeoutException e) {
      log.error("调用HttpUtils.sendGet SocketTimeoutException, url={},param={}", url, param, e);
    } catch (IOException e) {
      log.error("调用HttpUtils.sendGet IOException, url={},param={}", url, param, e);
    } catch (Exception e) {
      log.error("调用HttpsUtil.sendGet Exception, url={},param={}", url, param, e);
    } finally {
      try {
        if (in != null) {
          in.close();
        }
      } catch (Exception ex) {
        log.error("调用in.close Exception, url={},param={}", url, param, ex);
      }
    }
    return result.toString();
  }

  /**
   * 向指定 URL 发送POST方法的请求
   *
   * @param url   发送请求的 URL
   * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
   * @return 所代表远程资源的响应结果
   */
  public static String sendPost(String url, String param) {
    PrintWriter out = null;
    BufferedReader in = null;
    StringBuilder result = new StringBuilder();
    try {
      log.info("sendPost - {}", url);
      URL realUrl = new URL(url);
      URLConnection conn = realUrl.openConnection();
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
      conn.setRequestProperty("Accept-Charset", "utf-8");
      conn.setRequestProperty("contentType", "utf-8");
      conn.setDoOutput(true);
      conn.setDoInput(true);
      out = new PrintWriter(conn.getOutputStream());
      out.print(param);
      out.flush();
      in = new BufferedReader(new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8));
      String line;
      while ((line = in.readLine()) != null) {
        result.append(line);
      }
      log.info("recv - {}", result);
    } catch (ConnectException e) {
      log.error("调用HttpUtils.sendPost ConnectException, url={},param={}", url, param, e);
    } catch (SocketTimeoutException e) {
      log.error("调用HttpUtils.sendPost SocketTimeoutException, url={},param={}", url, param, e);
    } catch (IOException e) {
      log.error("调用HttpUtils.sendPost IOException, url={},param={}", url, param, e);
    } catch (Exception e) {
      log.error("调用HttpsUtil.sendPost Exception, url={},param={}", url, param, e);
    } finally {
      try {
        if (out != null) {
          out.close();
        }
        if (in != null) {
          in.close();
        }
      } catch (IOException ex) {
        log.error("调用in.close Exception, url={},param={}", url, param, ex);
      }
    }
    return result.toString();
  }

  public static String sendSSLPost(String url, String param) {
    StringBuilder result = new StringBuilder();
    String urlNameString = url + "?" + param;
    try {
      log.info("sendSSLPost - {}", urlNameString);
      SSLContext sc = SSLContext.getInstance("SSL");
      sc.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
      URL console = new URL(urlNameString);
      HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64)");
      conn.setRequestProperty("Accept-Charset", "utf-8");
      conn.setRequestProperty("contentType", "utf-8");
      conn.setDoOutput(true);
      conn.setDoInput(true);

      conn.setSSLSocketFactory(sc.getSocketFactory());
      conn.setHostnameVerifier(new TrustAnyHostnameVerifier());
      conn.connect();
      InputStream is = conn.getInputStream();
      BufferedReader br = new BufferedReader(new InputStreamReader(is));
      String ret;
      while ((ret = br.readLine()) != null) {
        if (!"".equals(ret.trim())) {
          result.append(new String(ret.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8));
        }
      }
      log.info("recv - {}", result);
      conn.disconnect();
      br.close();
    } catch (ConnectException e) {
      log.error("调用HttpUtils.sendSSLPost ConnectException, url={},param={}", url, param, e);
    } catch (SocketTimeoutException e) {
      log.error("调用HttpUtils.sendSSLPost SocketTimeoutException, url={},param={}", url, param, e);
    } catch (IOException e) {
      log.error("调用HttpUtils.sendSSLPost IOException, url={},param={}", url, param, e);
    } catch (Exception e) {
      log.error("调用HttpsUtil.sendSSLPost Exception, url={},param={}", url, param, e);
    }
    return result.toString();
  }

  private static class TrustAnyTrustManager implements X509TrustManager {
    @Override
    public void checkClientTrusted(X509Certificate[] chain, String authType) {
    }

    @Override
    public void checkServerTrusted(X509Certificate[] chain, String authType) {
    }

    @Override
    public X509Certificate[] getAcceptedIssuers() {
      return new X509Certificate[]{};
    }
  }

  private static class TrustAnyHostnameVerifier implements HostnameVerifier {
    @Override
    public boolean verify(String hostname, SSLSession session) {
      return true;
    }
  }
}